GHA: get Go version from go.mod (#62953)

There's no need to run a job to put the Go version in an environment
variable, since the setup-go action can determine the Go version
based on the go.mod file.

.github/workflows/build-macos.yaml

@@ -36,7 +36,6 @@ jobs:
       - name: Determine Toolchain Versions and cache paths
         run: |
           echo NODE_VERSION=$(make -s -C build.assets print-node-version) >> $GITHUB_ENV
-          echo GOLANG_VERSION=$(make -s -C build.assets print-go-version | sed 's/^go//') >> $GITHUB_ENV
           echo RUST_VERSION=$(make -s -C build.assets print-rust-version) >> $GITHUB_ENV
           echo PKG_CONFIG_PATH="$(build.assets/build-fido2-macos.sh pkg_config_path)" >> $GITHUB_ENV
 
@@ -44,7 +43,6 @@ jobs:
         run: |
           echo "make: $(make --version)"
           echo "node: ${NODE_VERSION}"
-          echo "go: ${GOLANG_VERSION}"
           echo "rust: ${RUST_VERSION}"
 
       - name: Install Node Toolchain
@@ -61,7 +59,7 @@ jobs:
         uses: actions/setup-go@v6
         with:
           cache: false
-          go-version: ${{ env.GOLANG_VERSION }}
+          go-version-file: go.mod
 
       - name: Install wasm-deps
         run: make ensure-wasm-deps

.github/workflows/integration-tests-win.yaml

@@ -47,20 +47,14 @@ jobs:
       - name: Checkout Teleport
         uses: actions/checkout@v6
 
-      - name: Get Go version
-        id: go-version
-        shell: bash
-        run: echo "go-version=$(make -s print-go-version | tr -d '\n')" >> $GITHUB_OUTPUT
-
       - name: Setup Go
         uses: actions/setup-go@v6
         with:
           cache: false
-          go-version: ${{ steps.go-version.outputs.go-version }}
+          go-version-file: go.mod
 
       - name: Run tests
         shell: bash
         run: |
           export OS="windows"
           go test -timeout 30m ./integration/autoupdate/tools -v
-